cmake -H. -Bbuild_dbg -DCMAKE_INSTALL_PREFIX=~/local/gflags_dbg \
    -DCMAKE_BUILD_TYPE=Debug \
	-DBUILD_gflags_LIB=ON \
	-DBUILD_STATIC_LIBS=ON \
    -DBUILD_SHARED_LIBS=OFF \
	-DINSTALL_STATIC_LIBS=ON \
	-DINSTALL_SHARED_LIBS=OFF \
    -DBUILD_TESTING=ON \
	-DREGISTER_INSTALL_PREFIX=OFF 
VERBOSE=1 cmake --build build_dbg --target install
